package com.btn.token.config;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.btn.token.service.UserService;
import com.btn.token.utils.ResultUtil;
import org.hibernate.criterion.NullExpression;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.ObjectUtils;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

/**
 * 拦截器，拦截所有请求信息，验证token信息
 */
public class AuthenticationInterceptor implements HandlerInterceptor {

    private final static Logger LOG = LoggerFactory.getLogger(AuthenticationInterceptor.class);

    @Autowired
    private UserService userService;

    @Value("${token.secret}")
    private String SECRET;

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) throws Exception {
        LOG.info("-----被拦截到了,开始校验token信息------");
        String method = httpServletRequest.getMethod();
        // 如果拦截到的是OPTIONS请求的话，则放行
        if (method.equals("OPTIONS")) {
            return true;
        }
        String token = httpServletRequest.getHeader("token");// 从 http 请求头中取出 token
        if (ObjectUtils.isEmpty(token)){
            return false;
//            throw new Exception("token不合法！！！" + token);
        }
        // 如果不是映射到方法直接通过
//        if(!(object instanceof HandlerMethod)){
//            return true;
//        }
//        HandlerMethod handlerMethod=(HandlerMethod)object;
//        Method method=handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证
//        if (method.isAnnotationPresent(PassToken.class)) {
//            PassToken passToken = method.getAnnotation(PassToken.class);
//            if (passToken.required()) {
//                return true;
//            }
//        }
//        //检查有没有需要用户权限的注解
//        if (method.isAnnotationPresent(UserLoginToken.class)) {
//            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
//            if (userLoginToken.required()) {
//                // 执行认证
//                if (token == null) {
//                    throw new RuntimeException("无token，请重新登录");
//                }
//                // 获取 token 中的 user id
//                String userId;
//                try {
//                    userId = JWT.decode(token).getAudience().get(0);
//                } catch (JWTDecodeException j) {
//                    throw new RuntimeException("401");
//                }
//                User user = userService.findUserById(userId);
//                if (user == null) {
//                    throw new RuntimeException("用户不存在，请重新登录");
//                }
        // 验证 token
        try {
            JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(SECRET)).build();
            jwtVerifier.verify(token);
        } catch (JWTVerificationException e) {
            throw new RuntimeException("401,请联系管理员");
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest,
                           HttpServletResponse httpServletResponse,
                           Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest,
                                HttpServletResponse httpServletResponse,
                                Object o, Exception e) throws Exception {
    }
}
